RNA-Binding Protein Sequestration and 3′UTR Dysregulation

Mechanistic description

Intron-retained GBA isoform sequesters neuronal RBPs (FMRP, HuR, TDP-43) that normally bind to wild-type GBA mRNA 3′UTR regulatory elements. Loss of RBP engagement disrupts poly(A) tail elongation, reduces miRNA protection, impairs dendritic localization, and causes wild-type GBA mRNA to be sequestered in P-bodies or undergo accelerated decay. TDP-43 aggregation observed in GBA-PD brains represents a high-value convergence target with ASO programs already in ALS clinical trials.

Evidence for (4)

FMRP binds GBA mRNA and regulates translation

PMID:32296178
TDP-43 aggregation disrupts intron retention clearance in GBA-PD

PMID:33711246
TDP-43 ASO programs in Phase I/II for ALS (Ionis/Biogen)

PMID:03036582
RBP sequestration by pathological transcripts shown in ALS/FTD

PMID:31092591

Evidence against (3)

FMRP is a translational repressor; sequestration should theoretically increase GBA translation, contradicting the model

PMID:30540932
HuR binds >1,000 transcripts; pan-HuR activation could cause widespread off-target effects

PMID:31191773
3′UTR dysregulation evidence in GBA haploinsufficiency is correlative, not mechanistic

PMID:30664795

Evidence matrix

4 supporting 3 contradicting

53% posterior support

Supporting

FMRP binds GBA mRNA and regulates translation PMID:32296178
TDP-43 aggregation disrupts intron retention clearance in GBA-PD PMID:33711246
TDP-43 ASO programs in Phase I/II for ALS (Ionis/Biogen) PMID:03036582
RBP sequestration by pathological transcripts shown in ALS/FTD PMID:31092591

Contradicting

FMRP is a translational repressor; sequestration should theoretically increase GBA translation, contradicting the model PMID:30540932
HuR binds >1,000 transcripts; pan-HuR activation could cause widespread off-target effects PMID:31191773
3′UTR dysregulation evidence in GBA haploinsufficiency is correlative, not mechanistic PMID:30664795

Bayesian persona consensus

53% posterior support

1 signal · 1 for / 0 against · agreement 100%

scidex.consensus.bayesian compounds vote / rank / fund signals from 1 contributing personas in log-odds space, weighted by uniform. Prior 50%.

Cite this hypothesis

Citation

etl-backfill (2026). RNA-Binding Protein Sequestration and 3′UTR Dysregulation. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-SDA-2026-04-26-gap-pubmed-20260412-094853-199f4f1b-03-rna-binding-protein-sequestration-and-3-utr-dysr-8ead52af3f

BibTeX

@misc{scidex_hypothesis_hsda2026,
  title        = {RNA-Binding Protein Sequestration and 3′UTR Dysregulation},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-SDA-2026-04-26-gap-pubmed-20260412-094853-199f4f1b-03-rna-binding-protein-sequestration-and-3-utr-dysr-8ead52af3f},
  note         = {SciDEX artifact hypothesis:h-SDA-2026-04-26-gap-pubmed-20260412-094853-199f4f1b-03-rna-binding-protein-sequestration-and-3-utr-dysr-8ead52af3f}
}